.zk-image-list-g {
    $list: 6;
    .zk-image-list {
        @for $list from 0 to 6 {
            .image-list-#{$list} {
                height: 100px;
                @if $list==0 or $list==1 {
                    width: 50%;
                }
                @if $list>1 {
                    width: 25%;
                }
            }
        }
    }
}